A compression tool is configured to compress one or more components of a delivery device, such as a closure element and one or more flanges of a pusher tube. The compression tool includes clamping means configured to close or release with rotation of actuating means (e.g., rotating means). In a closed position, the clamping means can sufficiently compress the one or more components of the delivery device so that a technician can easily position a garage tube about the compressed delivery device components. The assembled delivery device (or assembled garage tube) can then be removed from the compression tool upon reverse rotation of the actuating means, and subsequent opening of the clamping means.